Bookcase



FIG. 1 is a perspective view of my new bookcase;

FIG. 2 is a front elevational view of my new bookcase of FIG. 1;

FIG. 3 is a rear elevational view of my new bookcase, opposite that of FIG. 2;

FIG. 4 is a side elevational view of my new bookcase taken from the left side of FIG. 1;

FIG. 5 is a side elevational view of my new bookcase from a side opposite that of FIG. 4;

FIG. 6 is a top plan view of my new bookcase; and,

FIG. 7 is a bottom plan view of my new bookcase. 

CLAIM The ornamental design for a bookcase, as shown and described. 